Why does God allow suffering is the most commonly asked questions on Alpha. This and other pressing questions are discussed in Nicky Gumbel's book Searching Issues. We have taken the Searching Issues book and created individual booklets for each chapter. You may download them for free or buy the booklets or complete book here.

Why Does God Allow Suffering?
What About Other Religions?
Is There A Conflict Between Science and Christianity?
What About the New Spirituality?
Does Religion Do More Harm Than Good?
Is the Trinity Unbiblical, Unbelievable, and Irrelevant?
Is Faith Irrational?